World Library  
Flag as Inappropriate
Email this Article

Junkers J 29

Article Id: WHEBN0027851696
Reproduction Date:

Title: Junkers J 29  
Author: World Heritage Encyclopedia
Language: English
Subject: Junkers
Collection:
Publisher: World Heritage Encyclopedia
Publication
Date:
 

Junkers J 29

J 29
Role Training and sports aircraft
National origin Germany
Manufacturer Junkers Flugzeug Werke AG
Designer Ernst Zindl
First flight 22 April 1925
Number built 2

The Junkers J 29 was a two-seat, single-engined experimental training monoplane, built in Germany in 1925. Its significance is that it was the first aircraft to fly and test the Junkers Doppelflügel (double wing) control surfaces used very successfully on the later Junkers Ju 52.

Design and development

The Junkers J 29 was a small, aerodynamically clean low wing cantilever monoplane, constructed with Junkers' standard method of duralumin tube frames skinned with corrugated sheets of the same alloy. The wing of the J 29 was straight tapered, almost entirely on the trailing edge and had nearly square tips. The J 29 pioneered the patented Junkers Doppelflügel "double wing" control system - whose concept was used through to the Third Reich's Junkers Ju 87 Stuka dive bomber - using full span ailerons hinged just below the wing trailing edge and fully exposing the entire control surface cross-section to the slipstream, forming a slot between the two surfaces. In normal flight these were used as standard ailerons, but they could be lowered like flaps for landing whilst retaining the differential movement needed for lateral control.[1]

The fuselage was flat sided with rounded decking, the Junkers L1a inline engine cowled with its cylinder heads slightly exposed. Pilot and passenger sat side by side over the wing in a cockpit open apart from a longitudinal arch over their heads to protect them like a roll bar. This unusual feature reminded observers of a handle and earned the J 29 the nickname Bügeleisen (en: flat iron). The fuselage tapered to the parallel chord tailplane braced on top of it. The fin was blunt and the rudder wide chord and deep, moving within a cut out in the elevators. Neither rudder nor elevators were horn balanced. The fixed undercarriage had a standard Junkers layout, with short splayed main legs fitted with noticeable shock absorbers mounted to the forward wing root and braced forwards to points under the engine. The wheels were linked by a centrally hinged cross axle, mounted on a V strut below the fuselage.[1]

The first of two J 29s flew in April 1925. Though they had a Junkers sales description as the T 29, suggesting a training role and a hope of sales, they seem to have been built primarily to flight test the double wing which was successfully used on later Junkers aircraft such as the G 28, the Ju 52/3m and the Ju 87.[1]

Specifications

Data from Kay 2004 p.54-6

General characteristics
  • Crew: 1
  • Capacity: 1 passenger
  • Length: 7.15 m (23 ft 5 in)
  • Wingspan: 11.5 m (37 ft 9 in)
  • Height: 2.26 m (7 ft 5 in) [2]
  • Wing area: 17.7 m2 (191 sq ft)
  • Empty weight: 490 kg (1,080 lb)
  • Gross weight: 750 kg (1,653 lb)
  • Powerplant: 1 × Junkers L1a 6-cylinder upright aircooled inline, 62 kW (83 hp)

Performance

  • Maximum speed: 140 km/h (87 mph; 76 kn)
  • Cruise speed: 109 km/h; 59 kn (68 mph) [2]
  • Range: 470 km (292 mi; 254 nmi)
  • Service ceiling: 2,499 m (8,200 ft) [2]

References

This article was sourced from Creative Commons Attribution-ShareAlike License; additional terms may apply. World Heritage Encyclopedia content is assembled from numerous content providers, Open Access Publishing, and in compliance with The Fair Access to Science and Technology Research Act (FASTR), Wikimedia Foundation, Inc., Public Library of Science, The Encyclopedia of Life, Open Book Publishers (OBP), PubMed, U.S. National Library of Medicine, National Center for Biotechnology Information, U.S. National Library of Medicine, National Institutes of Health (NIH), U.S. Department of Health & Human Services, and USA.gov, which sources content from all federal, state, local, tribal, and territorial government publication portals (.gov, .mil, .edu). Funding for USA.gov and content contributors is made possible from the U.S. Congress, E-Government Act of 2002.
 
Crowd sourced content that is contributed to World Heritage Encyclopedia is peer reviewed and edited by our editorial staff to ensure quality scholarly research articles.
 
By using this site, you agree to the Terms of Use and Privacy Policy. World Heritage Encyclopedia™ is a registered trademark of the World Public Library Association, a non-profit organization.
 


Copyright © World Library Foundation. All rights reserved. eBooks from Project Gutenberg are sponsored by the World Library Foundation,
a 501c(4) Member's Support Non-Profit Organization, and is NOT affiliated with any governmental agency or department.